CN201569925U

CN201569925U - Temperature detecting and controlling system

Info

Publication number: CN201569925U
Application number: CN2009202144810U
Authority: CN
Inventors: 魏淑桃
Original assignee: Shanghai Polytechnic University
Current assignee: Shanghai Polytechnic University
Priority date: 2009-11-30
Filing date: 2009-11-30
Publication date: 2010-09-01
Anticipated expiration: 2019-11-30

Abstract

The utility model relates to a temperature detecting and controlling system which is characterized in that the system comprises a singlechip control circuit, an analog digital conversion circuit connected with the singlechip control circuit, and a signal collecting circuit connected with an input terminal of the analog digital conversion circuit, wherein the signal collecting circuit comprises a signal collecting and controlling module, an analog signal connecting module and a pulse signal collecting module which are respectively connected with the signal collecting and controlling module. Since the temperature detecting and controlling system adopts an embedded system, the traditional problem is solved, a system detecting circuit is simplified, and the reliability and the precision in system detection are improved. Since a power input module is provided with two types of power input ports, the compatibility is better; and since a power circuit is independently designed, the power supplied to the whole system is more stable.

Description

A kind of temperature measurement control system

Technical field

The utility model relates to a kind of embedded control system, is specifically related to a kind of embedded temperature measurement control system.

Background technology

At present, traditional temperature measurement control system is that employing pointer instrument dish is a show tools mostly, and inner is not the Digitizing And Control Unit of core with the embedded type CPU.But this type systematic realizes that the circuit of routine measurement function is very complicated, and low, the function singleness of precision is not almost having advantage aspect measuring process robotization, Measurement and Data Processing and the functional diversities.

The utility model content

The utility model provides a kind of temperature measurement control system, solving traditional detection system is difficult for or indeterminable problem, simplify the detection system circuit, improve the reliability of detection system, have high measurement and display precision, high-performance, multi-functional and advantage that upgrading space is big.

For achieving the above object, the utility model provides a kind of temperature measurement control system, it is characterized in that, comprises single chip machine controlling circuit, the analog to digital conversion circuit that is connected with single chip machine controlling circuit, and the signal acquisition circuit that is connected with the input end of analog to digital conversion circuit;

Above-mentioned signal acquisition circuit comprises the signals collecting control module, and the collection of simulant signal module and the pulse signal acquisition module that are connected respectively with the signals collecting control module;

The input end of above-mentioned signal acquisition circuit is connected with temperature sensor.

Above-mentioned single chip machine controlling circuit also is connected with keyswitch circuit, display control circuit, data storage circuitry and power circuit respectively.

Above-mentioned power circuit comprises Power Entry Module, transformation module that is connected with the output terminal of Power Entry Module and the power supply output module that is connected with transformation module output terminal, and the output terminal of this power supply output module is connected with the power supply input of single chip machine controlling circuit, signal acquisition circuit, keyswitch circuit, display control circuit and analog to digital conversion circuit.

Above-mentioned power circuit can insert the reference power supply in civilian AC power or the laboratory.

Above-mentioned keyswitch circuit adopts the key-press matrix array to trigger the mode that combines with the direct scan round of button and controls.

The utility model temperature measurement control system is compared with existing temperature-detecting device, its advantage is: the utility model has adopted embedded system, because computer technology and detection technique are organically combined, solving traditional detection system is difficult for or indeterminable problem, simplify the detection system circuit, improve the reliability of detection system, have high measurement and display precision, high-performance, multi-functional and advantage that upgrading space is big;

Power Entry Module of the present utility model leaves two kinds of power input mouths, can insert the reference power supply in civilian AC power or the laboratory, makes native system have better compatibility for the input power supply;

Power circuit independent design of the present utility model gives the power supply that is provided with total system more stable.

Description of drawings

Fig. 1 is the general structure synoptic diagram of the utility model temperature measurement control system;

Fig. 2 is the structural representation of the signal acquisition circuit of the utility model temperature measurement control system;

Fig. 3 is the structural representation of the power circuit of the utility model temperature measurement control system;

Fig. 4 is the circuit theory diagrams of signals collecting control module of the signal acquisition circuit of the utility model temperature measurement control system;

Fig. 5 is the circuit theory diagrams of the data storage circuitry of the utility model temperature measurement control system.

Embodiment

Below in conjunction with description of drawings embodiment of the present utility model.

See also shown in Figure 1, the utility model temperature measurement control system comprises single chip machine controlling circuit 1, the keyswitch circuit 3, display control circuit 4, data storage circuitry 5, analog to digital conversion circuit 6 and the power circuit 7 that are connected respectively with single chip machine controlling circuit 1, and the signal acquisition circuit 2 that is connected with the input end of analog to digital conversion circuit 6; The input end of described signal acquisition circuit 2 is connected with temperature sensor.

In the utility model, single chip machine controlling circuit 1 adopts the single-chip microcomputer 89C51RB2 of atmel corp.

To have adopted chip ADC0809 be a change-over circuit of core to analog to digital conversion circuit 6 in the utility model, and change-over circuit includes ADC0809 chip and 74HC04 chip.Wherein the 74HC04 chip just uses as signal inverter, and the ADC0809 chip has been born the work with the conversion of three road analog input signals.The ADC0809 chip is connected with the ale signal pin of single-chip microcomputer, and the time clock that makes the ALE pin be sent becomes one of working control signal of ADC0809 chip.The START signal pins of ADC0809 chip is connected on WR (non-) signal pins of single-chip microcomputer.In control program, as long as use the MOVX instruction of reading of data memory circuit 5, the ADC0809 chip will begin sampling work, and will change the digital signal of getting well and be sent on the P0 mouth of single-chip microcomputer.

The output terminal of signal acquisition circuit 2 connects the input end of analog to digital conversion circuit 6, see also shown in Figure 2, signal acquisition circuit 2 comprises signals collecting control module 21, and the collection of simulant signal module 22 and the pulse signal acquisition module 23 that are connected respectively with signals collecting control module 21.The first half among the figure is a collection of simulant signal module 22, and the latter half among the last figure then is a pulse signal acquisition module 23, and the physical circuit of the signals collecting control module 21 of signal acquisition circuit 2 as shown in Figure 4.In collection of simulant signal module 22 and pulse signal acquisition module 23, all on input end, earlier signal has been carried out once relatively processing and amplifying.Here integrated amplifier LM124 and slide rheostat have been formed a simple comparator circuit.When the resistance of slide rheostat was changed, the output threshold values of amplifier also changed thereupon.Just limit it under the situation of external input signal overtension again, when avoiding it that entire circuit is impacted, can also avoid missing the situation of useful signal.It is exactly under the situation that the applied signal voltage scope is known quite well that this design also has kind of a purposes, can carry out filtering signals in the mode of hardware circuit in this way, abandons to be lower than the following input voltage signal of threshold values.

Aspect collection of simulant signal, can come signal is stablized by the two-stage negative feedback through the simulating signal that compares processing and amplifying, get rid of various external factor and disturb the voltage fluctuation that is caused.Through after this a series of pre-service to signal, the simulating signal of input is sent to analog-to-digital conversion module, transfers to the 89C51 single-chip microcomputer after converting thereof into digital signal.

With the collection of simulant signal aspect similar be that pulse signal also can just can be accepted processing by the 89C51 single-chip microcomputer through a series of processings after the processing through amplifying circuit relatively.Behind comparator circuit, be provided with a triode switch amplifying circuit again, can send to single-chip microcomputer timely and accurately, trigger the relevant treatment program with the pulse signal that guarantees to capture at the advance signal treatment circuit.

See also shown in Figure 3, power circuit 7 comprises Power Entry Module 71, transformation module 72 that is connected with the output terminal of Power Entry Module 71 and the power supply output module 73 that is connected with transformation module 72 output terminals, and the output terminal of described power supply output module 73 is connected with the power supply input of single chip machine controlling circuit 1, signal acquisition circuit 2, keyswitch circuit 3, display control circuit 4 and analog to digital conversion circuit 6.Power Entry Module 71 has adopted the transformer of 220V in the utility model, also keeps the PowerLab port simultaneously, is used to connect the standard power of alterating and direct current environment of experiment.The transformation module adopts 7812 chips and 7805 chips to make the direct current pressure energy be stabilized in 12V and 5V, and has used the electric capacity of some 470 μ F and 0.1 μ F to carry out filtering, simultaneously, the working condition of green LED indication power unit has been installed also.The power supply output module 73 of power circuit 7 of the present utility model has gathered three output voltage and the 16V DC voltage of overlapping voltage-stabilizing systems.

Keyswitch circuit 3 of the present utility model includes four buttons and two switches, adopts chip SN74LS21 control, adopts the key-press matrix array to trigger the mode that combines with the direct scan round of button and carries out by key control.The display system that display control circuit 4 of the present utility model adopts four eight sections LED number display tubes to form allows system possess the ability of carrying out initiatively exchanging with the user.This number display tube is except using outside the chip for driving SN74LS373N, and digital display tube can be controlled by scan round and latches dual mode team displaying contents.Ask for an interview shown in Figure 5ly, data storage circuitry 5 adopts chip 24C02, and the 24C02 chip is that a 256 byte capacities are based on I ²Hold the Serial E 2PROM memory device of C bus, follow the two-wire system agreement.Two pins of the SCL of 24C02 chip and SDA are connected with single chip machine controlling circuit 1, just the data in the 24C02 chip are all read out in program initialization, carry out buffer memory in single-chip microcomputer.The preservation operation of being done when program is carried out is actually to be operated the buffer memory in the single-chip microcomputer.On reasonable time point, control program property again all covers all interior data of 24C02 chip.

Although content of the present utility model has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to restriction of the present utility model.After those skilled in the art have read foregoing, for multiple modification of the present utility model with to substitute all will be conspicuous.Therefore, protection domain of the present utility model should be limited to the appended claims.

Claims

1. a temperature measurement control system is characterized in that, comprises single chip machine controlling circuit (1), the analog to digital conversion circuit (6) that is connected with single chip machine controlling circuit (1), and the signal acquisition circuit (2) that is connected with the input end of analog to digital conversion circuit (6);

Described signal acquisition circuit (2) comprises signals collecting control module (21), and the collection of simulant signal module (22) and the pulse signal acquisition module (23) that are connected respectively with signals collecting control module (21);

The input end of described signal acquisition circuit (2) is connected with temperature sensor.

2. temperature measurement control system as claimed in claim 1 is characterized in that, described single chip machine controlling circuit (1) also is connected with keyswitch circuit (3), display control circuit (4), data storage circuitry (5) and power circuit (7) respectively.

3. temperature measurement control system as claimed in claim 2, it is characterized in that described power circuit (7) comprises Power Entry Module (71), transformation module (72) that is connected with the output terminal of Power Entry Module (71) and the power supply output module (73) that is connected with transformation module (72) output terminal;

The output terminal of described power supply output module (73) is connected with the power supply input of single chip machine controlling circuit (1), signal acquisition circuit (2), keyswitch circuit (3), display control circuit (4) and analog to digital conversion circuit (6) respectively.

4. temperature measurement control system as claimed in claim 2 is characterized in that, described power circuit (7) can insert the reference power supply in civilian AC power or the laboratory.

5. temperature measurement control system as claimed in claim 2 is characterized in that, described keyswitch circuit (3) adopts the key-press matrix array to trigger the mode that combines with the direct scan round of button and controls.